Drilling machine



Sept. 10, 1940- J. E. ELF ET AL DRILLING MACHINE original Filed Mayes,1939 SfPt. 10. 1940. y J. E. ELF Er A1. 2,214,666

DRILLING MACHINE Original Filed May 2 9, 1939 2 Sheets,-Sh@ u 2 FIG 5F'G 6 I E ,LL I I i i3 i l i3 0042/0 (Zr/575'; @y l TTORNEY d PatentedSept. 10, 1940 UNITED STATES PATENT OFFICE DRILLING MACHINE Continuationof application Serial No. 276,264,

May 29, 1939. This application March 20,1940,

Serial No. 325,012

9 Claims.

This invention relates to drilling machines for paper, felt, leather,cloth or other similar sheet material or a combination of such materialand the invention has for its principal object to provide a manuallyoperable drilling mechanism for such a drilling machine.

Another object of this invention is to provide the drilling machine withnovel operating means for the drill thereof.

Both these and other objects and attendantpadvantages of the inventionwill become more readily apparent from the detailed description thereofwhich follows, reference being had to the accompanying drawings in whichFigure ll is a side elevation and partial section of the drillingmachine.

Figure 2 is a horizontal sectional view taken on the line 2-2 of Figure1.

Figure 3 is a detail vertical section taken on the line 3 3 of Figure 1.

Figure 4 is a detail vertical section taken on the line 4-4 o Figure 1.

Figure 5 is a front elevation of the drilling mechanism. l n

Figure 6 is an enlarged vertical sectional view of the operating spindleof the machine.

Figure 7 is a detail sectional view of the drill.

and a portion of the spindle to which it is attached.

This application is a continuation of our prior application Serial No.276,264 filed May 29, 1939. The drilling machine forming the sub-jectmatter of the present invention is especially adapted for use inoiiices, small book binderies, in fact for any place of business whichrequires the perforation of paper or other sheet material in quantitieswhich do not warrant the use of a power driven machine. Hand operatedpunches are at present used for perforating small numbers of sheets at atime but this at best is a slow and therefore costly way of perforatingsheet material. With the present manually operated machine many timesthe number of sheets which can be collectively punched by hand at a timemay be collectively drilled by our hand operated drilling machine at onetime.

As illustrated in the gures of the drawings, the drilling machine has abase I which carries in the middle and the rear thereof the upright 2. Apair of guide rods 3, 3 are spacedly supported in front of the uprightand are mounted to slide in the horizontal brackets 4 and 5 which formpart of the upright 2 and extend forward thereof. Mounted to move withthe guide rods and adjusted to slide thereon isthe spindle carrier 6which has the spindle sleeve 1 adjustably held clamped therein. For thispurpose the spindle carrier 6 is split at the rear and can be drawntogether to rigidly clamp the spindle sleeve 1 in place inthe spindlecarrier. A hollow spindle 8 is journaled in the sleeve I for theoperation of a drill and is operated by the mechanism that willhereinafter be described.

The lower end of the guide rods 3, 3 carry the pressure plate 9 andsurrounding the guide rods between the pressure plate and the under sideof the bracket 5 are the expansion springs I0, I0. These springs areadapted to force the pressure plate 9 against the stack of sheets to bedrilled so as to hold the sheets compressed while the drilling operationtakes place. To release the pressure of the plate 9 on the sheets aftereach drilling operation, the guide rods 3, 3 carry the collars I I, I Iwhich engage the top of the spindle carrier 8 for movement thereby inorder to raise the guide rods andmove the pressure plates away from thesheets on the upward movement of the spindle after the drillingoperation has been completed. The spindle carrier in its normallyelevated position illustrated in Figure 5 thus holds the pressure plate`'in a correspondingly elevated position with the springs I0, I0compressed between it and the bracket 5. y Movement is imparted to thespindle carrier by the biiurcated lever arm I2 which embraces thecarrier and is pivotally attached thereto at I3, I3. The ends of thelever arm I2 are pivotally connected to the links I4, I4 which in turnare mounted'to swing at I5, I5 on opposite sides of the upright 2 nearvthe bottom thereof. In this way the pivotal connections between thelever arm I2, the upright 2 and the spindle carrier 6 permit themovement of the spindle carrier on the guide rods 3, 3 and the movementof the guide rods in the brackets 4 and 5 on the operation of thedrilling machine by the lever arm. When the lever arm is raised intothedottedline position illustrated in Figure l, the pivotal connectionbetween it and the links I4,. I4 has been moved past the center linebetween the pivotal i connection I3 of the lever arm to the carrierlandthe pivotal mounting I5 of the links on the up.- right 2, and this holdsthe spindle carrier 6 and i with it the pressure plate 9 in a normallyinoperative elevated position with the springs I0, I0 held compressed.

For thedrilling operation the lever arm is lowered so as to permit theexpansion of the springs I0, I0 for the downward movement of the guiderods 3, 3 with the pressure plate 9 on the movean opening in thepressure plate and drill the cap 34 and holds the thrust ball bearing 38in suitable non-metallic material.

stack of the Asheets in the manner that will hereinafter be described.After the sheets are drilled,, the lever arm l2 is raised to firstwithdraw the s drill from the perforation it has drilled into the sheetsand then raise the pressure plate 8 to `release its pressure from thesheets.

With the spindle in a raised positionqthe stack of sheets is released sothat it may be removed or relocated for the next hole to be drilledtherethru. To facilitate the movement of the sheets and provide for anaccurate positioning thereof relative to the drill, a trayll' is mountedto slide onthe base l in front of the upright 2. This tray is preferablymade of sheet metal and is slidably mounted on the rails i9, I9 whichare held xed on the baseand are made up of wood or other A guide 28,fastened to the under side of the tray as illustrated in Figure 1,engages between two of the rails i9 so as to guide the tray in astraight line movement on the base. A gauge rod 22 is carried in anelevated position bythe tray so as to move therewith. Gauge members 23,23 are movable on this gaugel rod so that they can be adjustably heldfixed. thereon by means `of their thumb screw 2Q. Each of the gaugemembers 23 has an vangular groove 25 in the top thereof to have theWedge shaped bottom of the locking latch 28 engage thereinto. in thebracket 5 and is vertically movable therein. For its operation the latchis provided with the latch rod 2l which extends upwardly therefrom topof the bracket 5 so as to surround the latch 26 and latch rod 21 in itsvertical movement, is a hollow 'cap 38 and in its is provided a spring3l which operates to move the latch 28 into engagement with a gaugemember 23 on the downward movement of the spindle carrier which releasesthe latch rod from its elevated inoperative position.

The drilling mechanism which is operated by the movement of the leverarm l2 is illustrated in detail in Figures 6 and 7 and compris-es aspindle made up of the non-rotating spindle sleeve l and the rotatinghollow spindle 8. The latter is mounted to rotate and is movable endwisein and out of the sleeve 'l and carries the hollow spiral 32. Thisspiral is threaded thru the nut 33 carried by the sleeve 'l so that whenthe spindle 8 is forced upward into the sleeve on the downward movementof the spindle carrier,

thespiral 32 and with it the yspindle 8 is rotated. The bottom of thespindle 8 is closed by the place in the bottom of the spindle for thesupport ofthe coil spring 31 which extends thru the hollow spindle8,'its'spira1 extension 32 andthe spindle -sleeveextension38-against-the ball bearing Ml- This locking latch is mounted located inthe top of the sleeve extension 38. A cap 39 at the top of the sleeveextension 38 holds the thrust ball bearing d in place therein. Ink

being/forced `thru thesheet material for the drillingmoperation. Anupward mov-ement of the lever arm I2 with the drill inl drillingengagement inthe sheet stock causes the nut 33 to rotatethefspiral inthe vopposite direction so that while the spring 3l remains compr-essedwithin the spindle, the drilling operation of the drillcontinues .withthev drill rotating in the opposite direction.l In this wayV one or moremovements of the lever arm I2 kwillcauseV the drill i8 *to be rotativelyforced into the sheet material until it f is completely'perforatedthereby. This operation takes place whether the lever arm isA given itsfull range of movement or only a -partial movement in either direction.

Tosupplement the action of the springtllffiny forcing the drill thru thesheet material on the rotation thereof, a spring A5I-surroundstheroutside ofthe spindle 8 and is interposed between the thrust ballbearing 52 and the washer 53-atv the bottom of the spindle sleeve-1. Inthis way the spring` 5l is jointly compressedl with the spring 31sothatboth springs exert their downward pressure on the spindle' for thedrillingoperation during the rotation ofV the drill.

For the rotation of the-drill lI6 bythe spindle; l

the cap 34- atethe bottom thereof is'provided with a threaded tubularextension 4l whichV carries the keys or lugs 82 on the end thereof. Thedrill I6 has `an enlarged head 43 whichv is slotted 'atthec topto'receive the lugs or keys-42 and the locking sleeve l which surroundsthe drill head -is threadedY ontothel extension lll of the cap 34itohold the drill lockedtothe spindle.

The drill proper comprises a straight hollow shank with an enlargedcutting edge at the bottom thereof. cylindrical outer wall andaninclined or beveled The latter is formed by a shortf inner-wall.The-beveled inner wall gradually re-j duces the opening leading intovthe hollow drill up to the opening d5.l Above this opening-timerVinsidediameter ofthe drill is enlarged and-a short f inclined shoulder48 extends-from the reduced opening l5v to this enlarged innercylindrical bore i of the drill shank.

Due to the fact that the drillingmechanism is f manually operated, it isimperative that the drill be forced thru the she-ets with a minimumeiTort on the` part of Ythe operator.

This is accom-1 plished by the ldrill because of its enlarged cuttingA jedge whichl perforatesv the sheets with a hol-e larger in diameter thanthe diameter of the outside of the hollow shank of the drill and thusreduces to a minimumlthe frictionbetween the rotating drill `and thewall of the out holes in thev y sheet stock.` 'Ihe discsorchips cut`from the sheets are forced into thev drill and are gradually,

cupped by the inwardly'tapering wall above-the j cutting edge' untilthey havelbeen forced pastfthel.`

opening 5in-the drill.: This causes the chipshto'.

formthey -retain withinf-the enlarged hollow drill shank after the chipshave been 'forced' thru the i opening 45; ,x' i v Removably threadedinto. the vtop of the head 43 of the drill I6 is the'dis'charge tube 54.This tube forms an extension ofthe drill so that the chips mayloosely=pass therethru and be discharged from an opening 55 in the sidethereof into the chute 56' located at the top of the spindle andfastened to the collar 51 of the cap 39.A In this way the chips aredischarged from the drilling machine to one side thereof.

The discharge tube 54 is provided with a knurled end 58 which forms ahandle with which the tube may be inserted thru the discharge chute 56and the spindle and threaded into the top of the drill I6. Variousdiameter discharge tubes are used to have them correspond with the sizedrill which is used in the drilling machine in order to efficientlycarry off the chips from the drill.

In the base l inline with the drill I6 are superimposed a series offreely rotating fiber washers so, su so that when the drin is forcedthru the sheet material its cutting edge may enter the surface of theuppermost of these discs and have the discs rotate therewith to preventinjury to the cutting edge of the drill.

In order to further preserve the cutting edge of the drill, the drillingmachine is provided with an adjustable stop for the spindle so that thedownward movement of the spindle may be arrested at a point just afterthe cutting edge of the drill has penetrated the bottom sheet of thematerial that is being perforated thereby. This stop is located to oneside of the cap 34 at the bottom of the spindle and comprises a freelyrotating disc 60 which is mounted to rotate on the shank 6l on top ofits flange 62. The shank 6I is mounted to vertically slide in thebracket and a knurled nut 63 is threaded on the shank above the bracket5. A keyway 64 is provided in the side of the shank so that the end ofthe set screw 65 can engage thereintoand keep it from rotating while thenut 53 is being rotated to cause the shank 6I to either move up or downin the bracket 5. In this way the freely rotating disc 60 may be raisedor lowered to serve as a variable stop for the spindle of the drillingmachine by having 'it engage the overhanging shoulder of the cap 34 ofthe spindle and thus stop the downward movement of the spindle at apredetermined point while the disc 60 rotates with the spindle. Afterthe stop has been set in its proper position the set screw 65 istightened so that the shank cannot be moved in either direction until itis released for a new adjustment.

In order to cushion any contact between the lug 28 of the spindlecarrier and the top of the cap 30, a rubber pad 65 surrounds the latchrod 21 on top of the cap.

We claim:

1. In a drilling machine the combination of a longitudinally movableinternally threaded spindle sleeve, a spindle movable in and out of oneend of said spindle sleeve, a spiral on said hollow spindle in threadedengagement with said spindle sleeve, a spring within said spindle sleevefor compression between them on the movement of the spindle into thespindle sleeve, a drill at the bottom of said spindle, meansfor forcingsaid spindle into said spindle sleeve to compress said spring and causethe rotation of said spindle with said drill by said spiral in onedirection and allow said spindle to be forced out of said spindle sleeveby said spring to cause the rotation ofsaid spindle with said drill inthe reverse direction.

2. In a drilling machine the combination as set forth in claim 1including a spring surrounding said spindle held between said spindleand` said spindle sleeve for simultaneous compression with the springwithin said spindle sleeve on the movement of the spindle into thespindle sleeve.

3. In a drilling machine the combination as set forth in claim 1 inwhich said spindle and said drill are hollow, an ejector tube extendingthru said spindle sleeve and said hollow spindle to said drill to guidethe chips from said drill thru said hollow spindle and said spindlesleeve.

4. In a drilling machine the combination of an upright, a spindlecarrier movable on said upright, an internally threaded spindle sleeveheld xed in said spindle carrier, a spindle movable in and out of saidspindle sleeve, a spiral carried by said spindle in threaded engagementwith said spindle sleeve, a spring held for compression between saidspindle sleeve and said spindle, a drill at the bottom of said spindle,a lever arm for movement of said spindle carrier on said upright to movesaid drill against the material to be drilled and thus cause the spindleto be forced into said spindle sleeve for the rotation of the spindle bysaid spiral and the compression of said spring between said spindle andthe spindle sleeve to cause the pressure of the spring to force thedrill against the material during the rotation of the drill by thespindle.

5. In a drilling machine the combination as set forth in claim 4including a stop member on said upright for engagement by said spindleto limit the endwise movement of said drill by said spindle in onedirection, means for adjusting said stop member relative to saidspindle.

6. In a drilling machine the combination of a base, an upright on saidbase, a spindle carrier movable on said upright, an internally threadedspindle sleeve held fixed in said spindle carrier, a hollow spindlemovable in and out of said spindle sleeve, a spiral carried by saidspindle in threaded engagement with said spindle sleeve, a spring heldfor compression between said hollow spindle and said spindle sleeve, ahollow drill at the bottom of said hollow spindle, an ejector tubecarri-ed by said hollow drill and extending thru said hollow spindle andspindle sleeve to carry off the chips from said drill, and means formoving said spindle carrier tov cause the drill to be moved against thematerial to be drilled and t`o cause the hollow spindle to be moved inand out of the spindle sleeve for the rotation of the drill by thehollow spindle while said spindle is held compressed between the hollowspindle and spindle sleeve and exerts pressure on the drill.

'7. In a drilling machine the combination as set forth in claim 6including a chute carried at the top of said spindle sleeve with saidejector tube extending thru said chute said ejector tube leading intosaid chute for depositing the ychips from said ejector tube in saidchute.

8. In a drilling machine the combination as set forth in claim 6including a supporting tray movable on said base in front of saidupright, a gauge member carried by said tray, a latch member movable onsaid upright and means operated by said spindle carrier for operatingsaid latch member to move into and out of engagement with said gaugemember.

9. In a drilling machine the combination of a base, an upright on saidbase, a spindle movand an outlet in able on saiduprighha drill carriedby saifd'spindle, a latch'rod movable on said uprightparallelv to saidspindle, a latch carried by said latch rod, means connecting saidspindle with said latch V`rod for movement thereby, a supporting traymovable onsaid base in front of said spind1eand

